Help with flex plate purchase...

[Rotech]

I finally ready to install a new 350 motor, but I need to buy a flex plate, went to summit a look thru there inventory, but I got stuck on the question where it ask me how many teeth I need? I really don't know which is the correct teeth count. Can some tell which one is the correct one for a 350?

Thanks in advance...

 

[pagrunt]

What starter do you have to use ? (inline or offset bolt mounting) They came with both 153 & 168 tooth flex plates depending on use. Most likely it would be the 153 tooth with the inline bolt starter.

 

[Rotech]

I was planning to purchase a mini torque starter with the flex plate. Planning to install header and don't want over heating starter.

 

[565bbchevy]

What year is the 350?

 

[ssn696]

Your block and starter will make the choice for you. 14" = 168 teeth, usually diagonal bolt holes on the starter pad, usually trucks. 12.75" = 153 teeth, usually parallel bolt holes on the starter pad, usually cars. GM automatics bolt on over either size.

 

[ttype]

'86 up 350(if it's a 1pce seal crank!) uses neutral balance front, but external balance flexplate... neutral balance 262-350. 400 is different animal altogether. is your crankshaft flange round?

 

[Rotech]

'86 up 350(if it's a 1pce seal crank!) uses neutral balance front, but external balance flexplate... neutral balance 262-350. 400 is different animal altogether. is your crankshaft flange round?

Here a pic of the crank...

 

[Rotech]

What year is the 350?

I believe it's a 72.

 

[565bbchevy]

I believe it's a 72.

You have a 2 piece rear main seal block which uses a neutral balance flexplate, as long as the block has the two straight across holes (red and blue) you can use either a 153 tooth or 168 tooth with mini starters that have a dual pattern. I always use the 168 tooth since I feel it gives a little more room accessing torque converter bolts.

 

[Rotech]

This looks like your picture?